A Novel High-Pressure Monoclinic Metallic Phase of V2O3

Abstract

Vanadium sesquioxide, V2O3, is a prototypical metal-to-insulator system where, in temperature-dependent studies, the transition always coincides with a corundum-to-monoclinic structural transition. As a function of pressure, V2O3 follows the expected behavior of increased metallicity due to a larger bandwidth for pressures up to 12.5 GPa. Surprisingly, for higher pressures when the structure becomes unstable, the resistance starts to increase. Around 32.5 GPa at 300 K, we observe a novel pressure-induced corundum-to-monoclinic transition between two metallic phases, showing that the structural phase transition can be decoupled from the metal-insulator transition. Using X-ray Raman scattering, we find that screening effects, which are strong in the corundum phase, become weakened at high pressures. Theoretical calculations indicate that this can be related to a decrease in coherent quasiparticle strength, suggesting that the high-pressure phase is likely a critical correlated metal, on the verge of Mott-insulating behavior.

The manuscript has been accepted by Physical Review Letters on Dec. 20 2013

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• Switching of the topologically trivial and non-trivial quantum phase transitions in compressed 1T-TiTe2: Experiments and Theory
• Metal-Insulator Transition and Lattice Instability of Paramagnetic V2O3
• Shining light on transition metal oxides: unveiling the hidden Fermi Liquid
• Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7
• Early-stage dynamics of metallic droplets embedded in the nanotextured Mott insulating phase of V${}_2$O${}_3$
• Low-temperature magnetic ordering and structural distortions in Vanadium Sesquioxide (V${}_2$O${}_3$)
• Disentangled cooperative orderings in artificial rare-earth nickelates
• How chromium doping affects the correlated electronic structure of V2O3
• Optical properties of V2O3 in its whole phase diagram
• Nanoscale self-organisation and metastable non-thermal metallicity in Mott insulators
• Lattice frustration in spin-orbit Mott insulator Sr3Ir2O7 at high pressure
• Current progress in vanadium oxide nanostructures and its composites as supercapacitor electrodes